AB18EJ&18HJ Maintenance Manual 3-1 © Oct 2020
3 SYSTEM DESCRIPTIONS
POWER SYSTEM
The model AB18EJ is powered by electric motor.
The model AB18HJ is powered by either of the
following two options：
• Kubota engine D1105-E4B-EU-X1
• Electric motor
The auxiliary power consists of a 12V battery to drive a
12V DC motor. The gear pump is splined to the output
shaft of the motor to provide auxiliary power for the
systems.
HYDRAULIC SYSTEM
AB18EJ：
The machine is driven by electric motor. The entire
hydraulic system can be divided into two sections: one
for boom functions, the other for chassis steering and
oscillation control.
When the motor operates, the pressure oil at the duplex
gear pump outlet goes through the electric proportional
flow valve and solenoid directional vavle on the
mainfiold and drives the hydraulic actuator to move. In
response to the varying flow necessary for different
boom functions, the electrical control system regulates
the motor rpm and operation mode of the duplex gear
pump (oil supply by single or dumplex pump) to enable
the delivery of pressure oil at varying flow.
AB18HJ：
The machine is driven by electric motor or engine. The
entire hydraulic system can be divided into two
sections: one for boom functions, the other for chassis
steering and oscillation control.
When the motor operates, the pressure oil at the duplex
gear pump outlet goes through the electric proportional
flow valve and solenoid directional vavle on the
mainfiold and drives the hydraulic actuator to move. In
response to the varying flow necessary for different
boom functions, the electrical control system regulates
the motor rpm and operation mode of the duplex gear
pump (oil supply by single or dumplex pump) to enable
the delivery of pressure oil at varying flow.
When the engine operates, the pressure oil at the
duplex gear pump outlet goes through the electric
proportional flow valve and solenoid directional vavle
on the mainfiold and drives the hydraulic actuator to
move. In response to the varying flow necessary for
different boom functions, the electrical control system
regulates the opening size of the electric proportional
flow valve and operation mode of the duplex gear pump
(oil supply by single or dumplex pump) to enable the
delivery of pressure oil at varying flow.
ELECTRICAL SYSTEM
AB18EJ：
The system adopts eight 6V lead acid batteries in
series or two 24V lithium battery in series to drive a 48V
DC motor for controlling boom functions and drive/steer
functions.
AB18HJ：
Diesel mode: the system adopts a 12V battery to start
the engine, auxiliary pump as well as the three
controllers for engine control, platform control and
ground control. The battery is charged by the DC
generator powered by the engine. The battery
separator is used for charging one of the two batteries
first and the other thereafter. Two circuit breakers are
used to protect the control system.
Electric mode：the system adopts eight 6V lead acid
batteries in series or two 24V lithium battery in series to
drive a 48V DC motor for controlling boom functions
and drive/steer functions.
ELECTRICAL SYSTEM
The machine functions are controlled by two
controllers, one installed on the left side of turntable to
control the boom functions, the other on the platform to
control the machine drive and boom functions. The
controller communicates signals through a high-speed
data bus.
SAFETY MEASURES
A series of proximity switches and limit switches are
used to provide signals for the controller.
• The level sensor measures the inclinations in X axis
and Y axis of the chassis. When the inclined angle
in X or Y axis exceeds 5°, the alarm will go off and
restrict such functions as lift, drive and steer.
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